Intraoperative monitoring of the electrical activity of the brain, spinal cord and peripheral nerves

NeurophysiologyThe cerebral cortex has an area of approximately 2.5 square feet, but only a third of this is found on the free surface. The cortex is thickest over the crest of a convolution, thinnest in the depth of a sulcus, and contains an estimated 14 billion neurons (Shepherd, 1990).